Releases·Tool Release
pydantic-ai v2.42.0 adds GitHub Copilot provider, rejects invalid DeferredToolResults approvals
Pydantic released six consecutive pydantic-ai versions (v2.38.0–v2.43.0, 2026-09-03 to 2026-09-11). Highlights include support for OpenAI gpt-6-astra and gemini-3.8-flash, Claude Fable 5.1 and Mythos 5.1, a vLLM provider, a GitHub Copilot provider, ChatGPT/Codex subscription auth, context-window tracking, barge-in handling in realtime sessions, and an @agent.on_event listener API. The releases matter to practitioners building agents who need current model support, cost tracking, and realtime voice control.
0 engagement6 sourcesThu, Sep 3, 2026, 07:48 AM
Developments
v2.43.0 (2026-09-11) adds a first-run clai session banner and fixes OpenAI text-part boundaries after tool calls
Sat, Sep 12, 2026, 12:54 AM
v2.40.0 adds barge-in handling for voice sessions, @agent.on_event listeners, and background price updates
Sat, Sep 5, 2026, 12:09 AM
AI Overview
- v2.38.0 adds `context_window` to `ModelProfile` and `context_window_used` to `RunContext` (PR #4611)
- Adds `gemini-3.8-flash` model support (PR #8021) and Claude Fable 5.1 / Claude Mythos 5.1 support (PR #7989)
- Adds `VLLMProvider` for connecting to vLLM servers (PR #6153)
- Application code and capabilities can emit typed `CustomEvent`s and `CapabilityEvent`s into run streams, subscribed via `@on_event` (PR #6258)
- Fixes span DeepSeek/Together forced `tool_choice` handling, Bedrock Mantle history replay, Anthropic `CodeExecutionTool` uploads, and first-tool-call cancellation resumability
- Bumps `genai-prices` dependency to 0.1.6
- v2.39.0 adds OpenAI gpt-6-astra model support (PR #8055)
- v2.39.0 detects Azure content-filter errors, fixes span-processor leaks in context_subtree() cache, and restores Instrumentation's include_model_request_parameters option
Entities
Related
Releases·Tool Release
pydantic/pydantic-ai v2.48.0 adds OpenAI gpt-6-sol/gpt-6-luna and Claude Opus 5.5 support
Pydantic released pydantic-ai v2.48.0 on 2026-09-22, adding model support for OpenAI's gpt-6-sol and gpt-6-luna, Anthropic's claude-opus-5-5, and new OpenAI audio models via genai-prices 0.1.7. It also fixes message-ID preservation in Vercel AI and AG-UI adapters and bumps genai-prices to 0.1.8.
Pydantic released pydantic-ai v2.48.0 on 2026-09-22, adding model support for OpenAI's gpt-6-sol and gpt-6-luna, Anthropic's claude-opus-5-5, and new OpenAI audio models via genai-prices 0.1.7. It also fixes message-ID preservation in Vercel AI and AG-UI adapters and bumps genai-prices to 0.1.8.
0 engagement1 sourcegithubTue, Sep 22, 2026, 12:00 AM
Releases·Tool Release
pydantic-ai v2.37.0 adds glm-5.3-flash support and Z.AI fixes
Pydantic AI released v2.37.0 (2026-08-31), adding the glm-5.3-flash model and reworking the Z.AI test suite onto cassettes. The release also fixes Z.AI's non-standard finish_reason mapping and AG-UI streaming behavior, improving agent-framework compatibility with Z.AI models.
Pydantic AI released v2.37.0 (2026-08-31), adding the glm-5.3-flash model and reworking the Z.AI test suite onto cassettes. The release also fixes Z.AI's non-standard finish_reason mapping and AG-UI streaming behavior, improving agent-framework compatibility with Z.AI models.
0 engagement1 sourcegithubTue, Sep 1, 2026, 01:48 AM
Releases·Tool Release
Pydantic AI v2.31.0 adds UIEventStream without run_input, fixes FallbackModel spans
Pydantic AI v2.31.0 was released on August 14, 2026, introducing a feature that allows UIEventStream to be built without a run_input and giving AGUIEventStream its own thread_id/run_id. It also includes bug fixes for FallbackModel span attribution and OpenAI compatibility in Temporal workflows.
Pydantic AI v2.31.0 was released on August 14, 2026, introducing a feature that allows UIEventStream to be built without a run_input and giving AGUIEventStream its own thread_id/run_id. It also includes bug fixes for FallbackModel span attribution and OpenAI compatibility in Temporal workflows.
1 engagement2 sourcesgithubFri, Aug 14, 2026, 12:00 AM
Releases·Tool Release
pydantic/pydantic-ai v2.47.0 names None output routes and hardens TypeSafeModel handling
Pydantic released pydantic-ai v2.47.0 on 2026-09-21, adding TypeSafeModel routing improvements and stricter validation of user prompt content. The release includes compatibility notes that change route naming and error behavior.
Pydantic released pydantic-ai v2.47.0 on 2026-09-21, adding TypeSafeModel routing improvements and stricter validation of user prompt content. The release includes compatibility notes that change route naming and error behavior.
0 engagement1 sourcegithubMon, Sep 21, 2026, 12:00 AM
Releases·Tool Release
Pydantic AI v2.26.0 adds tool hiding, run cancellation, prompt-cache retention
Pydantic AI v2.26.0, released August 6, 2026, introduces support for hiding function tools until revealed via tool search or load_capability, first-party run cancellation, and a method to resolve effective prompt-cache retention. These features give developers finer control over tool exposure and runtime management.
Pydantic AI v2.26.0, released August 6, 2026, introduces support for hiding function tools until revealed via tool search or load_capability, first-party run cancellation, and a method to resolve effective prompt-cache retention. These features give developers finer control over tool exposure and runtime management.
2 engagement1 sourcegithubThu, Aug 6, 2026, 12:00 AM